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Everyone can dig out an ancient text to do whatever they want.
In general terms you can. If you wanted to invade another country or stone someone to death for some arbitrary crime, you could probably find some religious writing somewhere that allows (or even encourages) it and use it as a pathetic attempt to excuse your violence. But this case is different I think. This wasn't an expression of a general desire to do violence, it was a specific act of revenge against a magazine that had published pictures of Muhammad. How would that desire to inflict revenge for a religious slight exist in the absence of religion?
I don't get it, cannon law has the same law pretty much word for word. Everyone can dig out an ancient text to do whatever they want.
http://www.vatican.va/archive/ENG1104/__P52.HTM